ARP who-has woes

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This is a little off topic, but I know this list has people in it who
can answer this easily.

We are a small ISP and I'm trying to figure out how to keep my customers
from getting so much ARP traffic.

Here's a very dumbed-down diagram of how the network is set up:
,------------.
| 4 T1 lines |
`------------'
       |
,--------------.
| Cisco Router |
`--------------'
       |
,-----------------.   ,------------------.   ,-------------.
| Ethernet Switch |---| Web/Email Server |---| DHCP Server |
`-----------------'   `------------------'   `-------------'
       |
(( Wireless Network ))
       |
,---------------.
| Customer's PC |
`---------------'


Right now, customers default gateway is set to the Cisco Router.  I'm
guessing I need to insert another router in the mix and customers should
be using it.  New diagram:
,------------.
| 4 T1 lines |
`------------'
       |
,--------------.
| Cisco Router |
`--------------'
       |
,-----------------.   ,------------------.
| Ethernet Switch |---| Web/Email Server |
`-----------------'   `------------------'
       |
,--------------.
| Linux Router |
`--------------'
       |
,-----------------.   ,-------------.
| Ethernet Switch |---| DHCP Server |
`-----------------'   `-------------'
       |
(( Wireless Network ))
       |
,---------------.
| Customer's PC |
`---------------'

Am I right?  If so, what do I need to do to get this going right?

Thanks in advance,

Travis



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